Added menu option to export decoded frames as CSV

More standard way of looking at parsed data

Handles multiple message types. Each message gets its own columns.
With many message types there are a lot of blank cells but its easy to
analyze.

mainwindow.cpp

@@ -119,6 +119,7 @@ MainWindow::MainWindow(QWidget *parent) :
     connect(ui->actionFuzzy_Scope, &QAction::triggered, this, &MainWindow::showFuzzyScopeWindow);
     connect(ui->actionRange_State_2, &QAction::triggered, this, &MainWindow::showRangeWindow);
     connect(ui->actionSave_Decoded_Frames, &QAction::triggered, this, &MainWindow::handleSaveDecoded);
+    connect(ui->actionSave_Decoded_Frames_CSV, &QAction::triggered, this, &MainWindow::handleSaveDecodedCsv);
     connect(ui->actionSingle_Multi_State_2, &QAction::triggered, this, &MainWindow::showSingleMultiWindow);
     connect(ui->actionFile_Comparison, &QAction::triggered, this, &MainWindow::showComparisonWindow);
     connect(ui->actionDBC_Comparison, &QAction::triggered, this, &MainWindow::showDBCComparisonWindow);